Vitrectomy is a generic term for surgery to treat the posterior segment of the eye, and it includes many types of surgery. In general, it is the main surgical operation with a vitreous cutting head, and then, depending on the type of disease, mainly referring to diseases of the posterior segment of the eye, such as vitreous hemorrhage, retinal detachment, or diabetic retinopathy, the first thing is to perform vitrectomy to remove the vitreous, including intravitreal The first step is to remove the vitreous, including the inflammation, impurities, and hemorrhage. Next, depending on the type of lesion, such as diabetic retinopathy, we can consider fundus laser, retinal detachment, retinal repositioning, fissure closure, macular fissure repositioning, and anterior macular membrane removal. Vitrectomy is a generic term for a class of surgery.